Sign PDF — free, private how-to guide
Add a signature or stamp image to a PDF entirely in your browser. Upload your document and a signature image (a transparent PNG works best), then place it on any page. Nothing is uploaded — both files stay on your device.
Updated
Step by step
Select your PDF
Drop or pick the PDF to sign. It is processed locally — never uploaded.
Add your signature
Upload a signature or stamp image, ideally a transparent PNG.
Place & download
Choose the page, position and size, then save the signed PDF.
Open Sign PDFCommon use cases
- Sign a contract or agreement
- Add a company stamp to a letter
- Place initials on a specific page
Frequently asked questions
Is this a legally binding e-signature?
This adds a visible signature image to the page. It is not a cryptographic or qualified e-signature — for that, use a certified e-signature service.
Is my document uploaded?
No. The PDF and signature image are processed entirely in your browser — nothing leaves your device.
What image format should I use?
A PNG with a transparent background looks cleanest. JPG also works but has a solid background.